Grinding machine



June 16, 1925. 1,542,624

J. D. M CLELLAND GRINDING MACHINE Filed Aug. 25, 1921 3 Sheets-Sheet 2 v I'IIIIII "mam.

INVENTOR (/HMES 0. Me 64 1 1 AND A TTOR/VEYS June 16,- 1925. 1,542,624

J. D. M CLELLAND GRINDING MACHINE Filed Aug. 25, 1921 3 Sheets-Sheet 5 D Y l'gaaa gm INVENTOR dA/msc 0. Mac/.51. 4 4N0 5 By flfi v 23 2 ATTORNEYS Patented June 16 1925.

UNITED STATES.-

JAMES D. MCCLELLAND, OF MOUNT VERNON, NEW YORK.

GRINDING MACHINE.

Application filed August 23, 1921. Serial No. 494,599.

To all whom it may concern:

Be it known that I, JAMES D. MOCLEL- LAND, a citizen of the United States, and a resident of Mount Vernon, in the county of Westchester and State of New York, have invented a new and Improved Grinding Machine, of which the following is a full, clear, and exact description.

This invention relates to a grinding machine primarily designed for sharpening lawnmower blades.

The general object of this invention is to provide a grinding machine with means for adjusting the positions of the bladesand the grinding means so as to give them the proper relative positions in order to get an even edge throughout the whole length of the blades.

This and other objects of the invention will be more clearly understood from the following detailed description and accompanying drawings.

Figure 1 is the side elevation of the grinding machine.

F igure 2 is an end elevation of the grinding machine.

Figure 3 is a top plan view showing the lawn mower blades in position.

Figure 4 is a plate adapted to slide on the bed plate to carry the grinding means.

Figure 5v is a bed plate that fits on the grinding .machine frame.

7 porting post shown in Figure 8.

Figure 10 is a cross-section of the guide rods which support the carriage carrying the supporting posts for the blades.

Figure 11 is a side elevation of the stationary supporting post for the blades.

Figure 12 is a cross-section along the lines v12-12, Figure 11.

Referring to the above. mentioned drawings, a frame is constructedof'legs 15 and 16 connected together by means of angle irons 17 and 18. .Mounted'on the angle irons 17 and 18 are blocks 19 and 20 which have grooves. 21 out therein. Guide rods 22 and 23 are mounted in the grooves in the blocks 19 and 20. These guide rods are held in position by means of caps 24 and 25, provided with grooves and which are connected to the blocks 20 and 19 respectively.

A bed plate 26 is bolted to the angle irons 17 and 18 of the fraine. This bed'plate has a depending member 27 in which there is an opening, and mounted in the opening is a bearing 28. This bed plate has integral therewith a plurality of projections 29 that extend upward. Mounted on this bed plate is a slidable plate 30. This slidable plate is provided with slots 31 that may be made of any predetermined length. The slots 31 in the plate '30 fit over the projections 29 which serve as guiding means for the plate 30. These projections also limit the movement of the slidable plate 30. An opening 32 is cut in the front part of the plate 30. On each side of the opening 32 and integral with the plate are bearing members 33 and 34. The plate is also provided with a flange 35 which extends downward and is provided with an opening which forms a bearing 36.

Pivotally mounted in the bearing members 33 and 34 and extending down through the opening 32 of plate 30 is a supporting bracket 37. This supporting bracket may swing about thepin 38 which extends through its base and through the bearing members 33 and 34. The upper portion of this supporting bracket semi-circular in shape and provided with bearings 39 and 40 which carry shaft 41. Mounted on this shaft 41 between the arms of the bracket are pulleys 42 and 43. A belt 44, "which may be driven by any suitable means, co-

operates with the pulleys 42 and 43 to operate the shaft. A grinding wheel 45, whichmay be of any desired material, is fixed to the shaft 41 outside of the arms of the bracket 37. The lower portion of the Y shaped bracket 37 has a ball member 46 mounted therein, and extending outward from the ball member are two cone shaped openings 47 and 48. The ball member 46 has a threaded opening 49 extending through it. A rod 50, which has a threaded end is journaled in the bearing 36 in the flange of the plate 30. The threaded end of the rod 50 engages in the threaded opening in the ball member 46. The outer end of the rod 50 has ahand wheel 51 mounted thereon. This hand wheel and rod serves to rotatethe bracket 37 about the pin 38 in order to move the grinding wheel to any desired position.

Mounted on the guiding rods 22 and 23 is a carriage. This carriage. consists of two blocks 52 and 53 having grooves 54 cut therein and which are held together by means of bars 55 and 56. The grooves 54 cut in the blocks 52 and 53 are of such a shape that they conform to the shape of the guiding rods. The grooves in the blocks are carefully machined so as to give a smooth bearing surface for sliding on the guide rods 22 and 23. Mounted on the carriage are two angle irons 57 and 58 and attached to these angle irons are supporting posts 59 and 60. The post 60 is fixed to the angle irons, but the post 59 may be adjusted so as to vary the distance between the posts 59 and 60.

The post 59 has an opening extending down into it into which a Y shaped mem-' ber 61 extends. This Y shaped member may be raised or lowered and held in any position relative to the post 59 by means of a set screw62. The bottom of the post- 59 has a flange 63 integral therewith and extending down from this flange is a tongue member 64. This tongue member 64 extends down between the angle irons 57 and 58 and the flange portion of the post rests on the angle irons. A U shaped member 65 fits over the tongue 64 and engages the angle irons 57 and 58. 'Bolts 66 project through openings in the U shaped member and flange 63 and connect the two together, thus holding the post 59 in any desired position.

The post 60 has an opening extending vertically down into it, in which the Y shaped member 67 is mounted. This member 67 may be held in any position by means of a set screw 68 which projects through the side of the post 60. The post 60 has a flange 69 integral with the base. Fixed to the angle irons 57 and 58 is a plate 70.-

This plate 70 has a slot 71 cuttherein. Extending from side to side of the plate and underneath the slot is a threaded bar 72 which is journaled in flanges integral with the plate 70. A hand wheel 73 is fixed to the bar 72 and serves to operate the same. Mounted on this plate 70 is the post 60. This post 60 is held in position by means of a stud 74 and a bolt 75. The stud 74 projects through the flange 69 and engages in a threaded opening in the plate 70. The bolt 75 which is provided with a head having a threaded opening 76 extending therethrough projects upward through the slot 71 and an opening in the flange 69 and is engaged by a wing nut 77. The rod 7 2 extends through the threaded opening 76 in the head of the bolt 75.

therewith a hand wheel 86. When it is desired to move the carriage to the right, the drum 84 is rotated, winding up the belt member 78 and releasing the spring belt member 79.

Attached to the plate 30 is a U-shaped member 87. This member has a threaded opening 88 extending through the bottom portion. Co-operating with this U-shaped member 87 is a rod 89, having a threaded end which engages in the threaded opening 88. The rod 89 is journaled in the hollow shaft 85. A hand wheel 90 is fixed to the end of the rod 89 and serves for operating the same. Attached to the bracket 37 is a supporting arm 92. Fixed to this supporting arm 92 is a guiding means controlled by a screw 93 for holding an arm 94 in an upright position. This arm 94 serves as a rest to retain the lawn mower blade in any desired position.

The operation of this device is as follows j The lawn mower blades 91 are mounted in the Y-shaped members 61 and 67 of the posts 59 and 60 respectively. The carriage on which the supporting posts are mounted may then be moved along the frame to any desired position by the operation of the hand wheel 86. The grinding wheel 45 is then moved into contact with the blades 91. This movement of the grinding wheel is accomplished by first rotating the hand wheel 90 to slide the plate 30 along the bed plate 26. After this rough adjustment has been made the hand wheel 51 is operated to give fine adjustments of the grinding wheel.

If the blades are not in the alinement desired they may be moved through the operation of the hand wheel 73. In order to operate the hand wheel 73, the wing nut 77 is first released and then the hand wheel may be operated, carrying the bolt 75 along the threaded rod 72. The bolt 75 is in engagement with the flange 69 of the post 60 and as the bolt moves along the rod 72 the post is rotated about the stud 74. After the blades 91 have been properly alined, the grinding wheel 45 is set in motion. The blades are moved across the face of the grinding wheel by the operation of the hand wheel 86.

It will be apparent from the above de' scri tion that in the case of worn blades, thebla es and the grinding wheel may be so adjusted to give an even amount of grinding'throughout the length of the blade.

I would state in conclusion that while the illustrated example constitutes a practical embodiment of my invention, I do not limit myself strictly to the exact details herein illustrated, since, manifestly, the same can be considerably varied without departing .from the spirit of the invention, as defined in the appended claims.

What I claim is:

1. A machine for sharpening lawn mower blades While arranged in tubular form, comprising a' frame, a sliding member arranged on said frame adapted to slide longitudinally of the frame, a pair of guide rails for causing the sliding member to move in a straight line, a pair of belts, said belts being connected to the opposite ends of said sliding member, a plurality of guides for guiding said belts to a central position beneath said sliding member, a pair of drums operatively associated with said belts for causing one belt to be pulled while the other is released and thereby cause a movement of said sliding member, a pair of supports mounted in said sliding member for rotatably supporting a group of lawn mower blades arranged in tubular formation, means for adjusting one of said supports laterally so that the edge of said blades will move'in a plane parallel to the movement of said sliding member, a grinding member carried by said adjacent the grinding member adapted to engage the under face of each of said blades as it is being operated on by said grinding member, said blades being positioned to be engaged by said grinding member one at a time.

2. A machine for sharpening lawn mower blades, comprising a frame, a sliding member arranged on said frame adapted to slide longitudinally of the frame, a pair of guide rails for causing the sliding member to move in a straight line, a pair of belts, said belts being connected to the opposite ends of said sliding member, a plurality of guides for guiding said belts to a central position beneath said sliding member, a pair of drums operatively associated with said belts for causing one belt to be pulled while the other is re eased and thereby cause a movement of said sliding member, a pair of supports mounted in said sliding member for rotatably supporting a group of lawn mower blades arranged in tubular formation, a grinding member positioned to grind said blades as they are moved by said belts, and an adjustable brace adapted to engage each of said blades as it is being ground for supporting the same in a redeterm'ined position in respect to the grinding member as the sliding member moves the blades past the grinding member. 7

JAMES D. MCCLELLAND. 

